A2 Physics ISA soon

jewii · 5 Feb 2011 at 17:15

i got an A2 isa soon. i just want to clear up some things on uncertency

ok lets say we measured something and it's 5.0(X) and the precision was +/- 0.1

the percentage uncertency = 2% and if we times or devide X the percentage uncertency is constant right? but if we apply a power to X, we times the % uncertency by the power. i.e. X^3 is 6% uncertain.

so what happens when we apply functions? for example

ln(X) or tan(X) dooes the percentage uncertency stay constant so we just find the uncertency value by ln(X) * 0.02 = +/- 0.02ln(X)

so is this all correct exspecially the function part?

Energize · 5 Feb 2011 at 17:19

ISA = Individual Savings Account?

orderoftheflame · 5 Feb 2011 at 17:23

Energize said:
ISA = Indiviual Savings Account?

Iranian Space Agency, I assume he's applying for a position.

PGdude · 5 Feb 2011 at 17:25

Investigative Skills Assessment.

I'll have a look through my current and old notes to see if I can help, but OcUK is really not the place to be asking for this kind of help.

J.B · 5 Feb 2011 at 18:08

orderoftheflame said:
Iranian Space Agency, I assume he's applying for a position.

In Iran, all you need is an A2 in physics to sign up

PhilthyPhil · 5 Feb 2011 at 18:09

Apply the function to the maximum and minimum values of x and use this to determine percentage uncertainty

Inquisitor · 5 Feb 2011 at 18:14

Well the correct way to do it would be to use a Taylor expansion of the function in question and use the leading order term to determine how the error is affected, but this might be beyond the scope of the course.

Dunks · 5 Feb 2011 at 18:47

PGdude said:
Investigative Skills Assessment.

I'll have a look through my current and old notes to see if I can help, but OcUK is really not the place to be asking for this kind of help.

Yeah, because A2 is above us all

flibbage0 · 5 Feb 2011 at 21:21

I've done this exact ISA, I did badly in it.

Is it on capacitors?

jewii · 5 Feb 2011 at 22:34

nah SHM, it's a lot worse than capacitors, you have to count the number of ossiclations in a period of time, it's damn hard when it's at a high frequency and low amplitude, and just ot make it even harder, it vibrated near the natural frequency making the amplitude keep going big and small again

made me so dizzy at the end, really bad

for all your cool guys above, it means simple harmonic motion not singularity homing monster. (top of my head)

jewii · 10 Feb 2011 at 19:40

kick it's ass out the door!

PGdude · 10 Feb 2011 at 20:15

You done it, if you don't mind me asking about it?

jewii · 11 Feb 2011 at 08:06

sure, what do you want to know lol?

WingZero30 · 11 Feb 2011 at 08:11

jewii said:
nah SHM, it's a lot worse than capacitors, you have to count the number of ossiclations in a period of time, it's damn hard when it's at a high frequency and low amplitude, and just ot make it even harder, it vibrated near the natural frequency making the amplitude keep going big and small again made me so dizzy at the end, really bad

for all your cool guys above, it means simple harmonic motion not singularity homing monster. (top of my head)

Ahh the boring stuff. I remember we studied extensively about SHM in A level Physics and did lot of lab experiments involving SHM with pendulum bob lol. If I had known something about cpu workings, I would have thought in terms of cpu frequency and transistors lol. Would have made it more interesting.

lukefinch · 11 Feb 2011 at 09:22

Ask me next year when im doing A2 Physics